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<br />Cement$10rogesilo- <br /> <br />Reloining <br />wall- <br /> <br /> <br />Water mel,r <br /> <br />~. <br /> <br /> <br />Soil Slatkpile <br /> <br /> <br />Pug mill mIxer <br />tonlinuous flow-lwi., screw <br /> <br />/SOil flld <br />~ <br /> <br />-Storage hopper <br /> <br />m <br /> <br />Figure 2.7 Schematic of continuous flow mixing plant for soil cement (Hansen) <br /> <br />Handlina <br /> <br />The soil cement mixture shall be transported from the mixing area to the embankment in <br />clean equipment provided with suitable protective devices in unfavorable weather. The total <br />elapsed time between the addition of water to the mixture and the start of compaction shall <br />be the minimum possible. In no case should the total elapsed time exceed thirty (30) <br />minutes. This time may be reduced when the air temperature exceeds 320 C (900 F), or <br />when there is a wind that promotes rapid drying of the soil cement mixture. <br /> <br />Placina <br /> <br />The mixture shall be placed on the moistened subgrade embankment, or previously <br />completed soil cement, with spreading equipment that will produce layers of such width and <br />thickness as are necessary for compaction to the required dimensions of the completed soil <br />cement layers. The compacted layers of soil cement shall not exceed 200 mm (8 inches), <br />nor be less than 100 mm (4 inches) in thickness. Each successive layer shall be placed as <br />soon as practical after the preceding layer is completed and certified. <br /> <br />All soil cement surfaces that will be in contact with succeeding layers of soil cement shall be <br />kept continuously moist by fog spraying until placement of the subsequent layer, provided <br />that the contractor will not be required to keep such surfaces continuously moist for a period <br />of seven (7) days. <br /> <br />Mixing shall not proceed when the soil aggregate or the area on which the soil cement is to <br />be placed is frozen. Soil cement shall not be mixed or placed when the air temperature is <br />below 70 C (450 F), unless the air temperature is 50 C (400 F) and rising. <br /> <br />2.9 <br />